REVENUE, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	$ 118,251	$ 113,668
Direct to Customer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	85,017
Through Distribution [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	33,234
Connectivity Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	42,919
Magnetic Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	38,228
Power Solutions and Protection [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	37,104
North America [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	59,457
North America [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	37,897
North America [Member] | Through Distribution [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	21,560
North America [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	31,046
North America [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	8,051
North America [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	20,360
Asia [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	38,620
Asia [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	32,927
Asia [Member] | Through Distribution [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	5,693
Asia [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	3,420
Asia [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	27,825
Asia [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	7,375
Europe [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	20,174
Europe [Member] | Direct to Customer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	14,193
Europe [Member] | Through Distribution [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	5,981
Europe [Member] | Connectivity Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	8,453
Europe [Member] | Magnetic Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	2,352
Europe [Member] | Power Solutions and Protection [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	$ 9,369